Tailored Oxidation Barrier Coatings for Mo-Hf-B and Mo-Zr-B Alloys

Smokovych, Iryna; Bolbut, V.; Krüger, Manja; Scheffler, Michael

doi:10.3390/ma12142215

Cited by 9 publications

(10 citation statements)

References 29 publications

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“…[17] Microstructure optimized for a) maximum oxidation resistance, b) creep resistance, and c) damage tolerance. [9,28,29,41,56,93] ). Alloy compositions are given in at%, TZM.…”

Section: Coating Requirementsmentioning

confidence: 99%

“…Cyclic oxidation tests at 800 C showed a catastrophic weight loss of the uncoated samples within the first 10 h of the test, whereas only a small weight increase was observed for the coated samples within 100 h. The high oxidation resistance and the slight weight gain were attributed to the formation of a continuous and dense borosilicate-glass scale on the coatings surface, which further slows down the oxidation kinetics of the samples, leading to stable weight changes for more than 100 h at 800 and 1100 C. The test results are visualized in Figure 29. [33,80,84,93] Summary Ceramic Coatings: Ceramic coatings are often used in the TBC/EBC field to protect components from corrosion, oxidation, and high temperatures. Compared with metals, ceramic materials offer higher melting temperatures and lower thermal conductivity.…”

Section: Dip Coating With Pre-ceramic Polymersmentioning

confidence: 99%

“…[94] The addition of boron has proved to be particularly promising, as it promotes the formation of an additional, glass-like protective scale. [93]…”

Section: Dip Coating With Pre-ceramic Polymersmentioning

confidence: 99%

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Oxidation‐Resistant Environmental Barrier Coatings for Mo‐Based Alloys: A Review

et al. 2020

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Molybdenum‐based materials offer high melting temperatures and promising mechanical properties; therefore, they are potential candidates for high‐temperature components, such as turbine blades. However, at temperatures above 700 °C, molybdenum suffers from severe pesting phenomenon, leading to decomposition of the component. Therefore, oxidation‐resistant environmental barrier coatings are crucial to prevent the material from degradation and to maintain its excellent mechanical properties at high temperatures. This review provides a detailed overview on the different coating concepts for Mo and Mo‐based alloys.

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“…[17] Microstructure optimized for a) maximum oxidation resistance, b) creep resistance, and c) damage tolerance. [9,28,29,41,56,93] ). Alloy compositions are given in at%, TZM.…”

Section: Coating Requirementsmentioning

confidence: 99%

Section: Dip Coating With Pre-ceramic Polymersmentioning

confidence: 99%

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Oxidation‐Resistant Environmental Barrier Coatings for Mo‐Based Alloys: A Review

et al. 2020

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“…Thus, the main oxidation protection mechanism of the coating will be based on a thermally stable SiO 2 glassy layer, which may have, due to its viscosity, self-healing properties. [26,31,40]…”

Section: Sample Codementioning

confidence: 99%

New‐Type Oxidation Barrier Coatings for Titanium Alloys

Smokovych

Scheffler

et al. 2020

Adv Eng Mater

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Herein, a new type of oxidation protection coating for Ti alloys is developed based on a perhydridopolysilazane preceramic polymer and particulate AlB 2 , Si, B, and Ti 3 AlC 2 (so-called MAX phase) fillers; MAX phases are used due to their high temperature and corrosion resistance, thermal shock resistance, and self-healing capability. For coating consolidation, the as-coated samples are pyrolyzed in argon or nitrogen and exposed to air at 800 C for up to 100 h. Although coatings containing AlB 2 or elemental Si and B show a small mass gain in the initial state of exposure to air and after no mass gain up to 100 h, MAX phase-loaded samples show a significant mass gain up to 7 h of exposure and a sudden mass decrease, which corresponds to coating layer spallation. The mechanisms leading to oxidation protection in AlB 2-filled systems are explained with an alumina layer formation and a glass formation from the preceramic polymer. In Si-and B-filled systems, a borosilicate glass phase may be able to reduce the oxygen diffusion capability and the MAX phases as fillers need further investigations; they may cause thermally induced mechanical stresses in the protective coatings.

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“…Silica-based ceramics, which are synthesized from preceramic polymers, have been widely used as surface-coating materials to protect various components from dust, dirt, and moisture [ 1 , 2 ]. Perhydropolysilazane (PHPS) is a promising preceramic polymer for protecting organic and inorganic materials in corrosive and oxidative environments [ 3 , 4 ] because it can be easily used to synthesize high-quality silica layers on metallic materials through room-temperature hydrolysis or oxidation [ 5 , 6 ]. As silica-based ceramics are non-conductive and have high thermal resistance, their application as a simple separating layer, for example, as an insulating layer on semiconductor substrates, has been investigated.…”

Section: Introductionmentioning

confidence: 99%

Fine-Structure Analysis of Perhydropolysilazane-Derived Nano Layers in Deep-Buried Condition Using Polarized Neutron Reflectometry

et al. 2020

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A large background scattering originating from the sample matrix is a major obstacle for fine-structure analysis of a nanometric layer buried in a bulk material. As polarization analysis can decrease undesired scattering in a neutron reflectivity (NR) profile, we performed NR experiments with polarization analysis on a polypropylene (PP)/perhydropolysilazane-derived SiO2 (PDS)/Si substrate sample, having a deep-buried layer of SiO2 to elucidate the fine structure of the nano-PDS layer. This method offers unique possibilities for increasing the amplitude of the Kiessig fringes in the higher scattering vector (Qz) region of the NR profiles in the sample by decreasing the undesired background scattering. Fitting and Fourier transform analysis results of the NR data indicated that the synthesized PDS layer remained between the PP plate and Si substrate with a thickness of approximately 109 Å. Furthermore, the scattering length density of the PDS layer, obtained from the background subtracted data appeared to be more accurate than that obtained from the raw data. Although the density of the PDS layer was lower than that of natural SiO2, the PDS thin layer had adequate mechanical strength to maintain a uniform PDS layer in the depth-direction under the deep-buried condition.

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Tailored Oxidation Barrier Coatings for Mo-Hf-B and Mo-Zr-B Alloys

Cited by 9 publications

References 29 publications

Oxidation‐Resistant Environmental Barrier Coatings for Mo‐Based Alloys: A Review

Oxidation‐Resistant Environmental Barrier Coatings for Mo‐Based Alloys: A Review

New‐Type Oxidation Barrier Coatings for Titanium Alloys

Fine-Structure Analysis of Perhydropolysilazane-Derived Nano Layers in Deep-Buried Condition Using Polarized Neutron Reflectometry

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